Abstract

Poster - Splinter Activity

Solar near-surface flows from ring-diagram helioseismology

B. Proxauf¹, B. Löptien^1,2, L. Gizon^1,2
1Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany
²Institut für Astrophysik, Georg-August Universität Göttingen, 37077 Göttingen, Germany

There are many reasons to want to measure flows in the solar near-surface layers: to study convection, flows around active regions, differential rotation and meridional circulation, and even waves of vorticity (Rossby waves). Here we use a method of local helioseismology known as ring-diagram analysis applied to SDO/HMI observations to infer horizontal flows and their dependence on depth. We present a comparison of ring-diagram and granulation-tracking results, showing that the flows measured by the two methods are in good agreement both qualitatively and quantitatively.